Traverse mechanism



Dec. 27, E, K BAUER TRAVERSE MECHANISM 2 She'ets-Sheet 1 Filed July 8,1946 w T m V W.

ERA/E67 K. BAUER .Dec. 27, 1949 BAUER TRAVERSE MECHANISM 2 Sheeils-Sheet2 Filed July 8, 1946 INVENTOR. ERNEST K. BAUER invention.

Patented Dec. 27 1949 TRAVERSE MECHANISM Ernest K. Bauer, Meadville,Pa., assignor to American Viscose Corporation, Wilmington, Del., acorporation of Delaware Application July 8, 1946, Serial No. 682,095

18 Claims.

This invention relates to a traverse mechanism including a buildermechanism for regulating the traverse in winding yarn on bobbins,particularly in a spinning or twisting frame.

It is desirable that warp yarn bobbins contain the greatest possiblelength of yarn and accordingly it is desirable that the windings allextend to the extreme bottom or butt of the bobbin. The upper end or tipof the full bobbin is preferably tapered, however, to prevent more thanone layer of yarn being pulled on" at a time, with consequent snarlingof the yarn.

A principal object of this invention is to provide an improvedconstruction of traverse mechanism in which the number of relativelysliding parts are reduced to a minimum. Thus, all of the main workingparts are interconnected for relative pivotal or rotary motion ratherthan translational sliding movements.

A further object is to provide a traverse construction free of chainsand similar relatively loose connections that are subject to stretchingand the development of excessive vibration.

It is another object of this invention to provide an improvedconstruction of traverse mechanism including a builder mechanism, bywhich these described results may be attained.

A more specific object is to provide a builder mechanism by which thelength of the winding may be repeatedly increased and decreased, withthe variation in length occurring at the tip end of the bobbin only.

The present invention further relates to certain arrangements andcombinations of parts which will be hereinafter described and moreparticular- In the drawing, illustrative of a preferred embodiment ofthe invention,

Figure 1 is a front elevation showing the essential linkage of thetraverse mechanism,

Figure 2 is a front elevation, on a larger scale and with parts removed,showing the builder mechanism,

Figure 3 is a section through the builder mechanism taken on lineIII-III of Figure 2, but somewhat enlarged,

Figure 4 is a view taken on line IVIV of Figure 3, with parts partiallycut away, still further enlarged somewhat, and

Figure 5 is an elevation of a bobbin, such as may be obtained by use ofthe builder motion of this As shown in the drawing, the traversemechanism serves to reciprocate the bobbin rail 2 vertically, though itcould be used to traverse any other rail transversely or longitudinallyof its length. For example, in the cap twister shown, it could beapplied to move the cap rail. In a ring twister, it could traverseeither the ring rail or the bobbin rail. It could likewise serve totraverse a thread guide rail.

As shown more specifically in Figure 2, the rail 2 supports hollowspindle motors M for driving spools S carried thereby. Caps C aresupported on stationary posts P shackled at A to a stationary rail Rcarried by the frame of the spinning machine comprising the end framestructure F shown.

Figure 1 particularly shows the traverse linkage comprising a pluralityof bell crank levers 3 whose fulcrums are pivotally mounted instationary supports or brackets 4. 1

Means is provided for constraining the motion of the rail 2 to astraight line path at right angles to the rail. This motion-controllingmeans is constructed of the following elements. At least one of thelevers 3 has one arm 3a constituting a link connected to one end of alever 5 which has its other end connected to a link 6 pivotally mountedon a stationary support or bracket I. The arm 3a and link 6 may be ormay not be equal in length but the rail 2 is pivotally connected to thelever 5 at a point 8 whichis the point of intersection of a line 9extending between the pivots in brackets 4 and 'l with the rail 2 whenthe rail is at an intermediate position, preferably near or at themid-position of its longest stroke. It will be observed that thiscontrolling means is free of translatory sliding motions, all linksbeing pivotally connected.

Means is also provided for bracing the rail 2 at intervals with suitablefollower levers. To accomplish this all of the levers 3 are connected toa common rod Ill at points i l and one or more of the levers 3 (otherthan those connected to levers 5) are connected to links I2 which areconnected to the rail 2 at l3. If desired, each lever 3 may be connectedto the rail 2 by a lever 5 and in this case, no links 12 are needed. Itwill thus be'seen that the rail 2 has a plurality of points 3 andoptionally I3 at which it is supported by levers 5 and optionally linksl2 and any movement of the rod l0 transfers motion to rail 2simultaneously through levers 3, levers 5, and links H. (when the latterare used).

Any suitable means for traversing the rail is operatively connected tothe system just described at one of the points I! by means of a link M.The present invention provides an improved traversing means whichcomprises, as its most important elements, two levers l5 and I6connected together by two links H and i8, a main cam l9, and, when abottle-shaped winding is desired, a builder cam 20.

The relationship of these parts is best shown in Figures 2 to 4inclusive. While the terms rod, lever and link used herein generallyconnote elements of simple structure, it is to be understood that theyinclude simple and composite structures as well, the latter being shownspecifically herein in many instances. For ex-' ample, rod 10 actuallycomprises two parallel rods bolted together at intervals with spacingelements llla thcrebetween (see Figure 2).

The lever is (Figures 2 and 3) is pivotally connected to link It at Maand has two parts l5a and l5b adjustably connected by bolts or car;screws 2| extending through slots 22 in the upper part I5a. Thisadjustment makes it possible to vary the length of the stroke.Lengthening lever l5 increases the length of stroke and Vice versa. Thelower part i527 of lever 15 is bifurcated and each leg thereof ispivotally connected to a supporting housing 23 in bearings 24. Each leghas a laterally projecting portion |5c having a pivotal connection at 25with a link i! which as shown may be bifurcate at the pivot mentioned. Ashaft or pivotal bearing 25 is carried by the two lower ends of thelinks H. The link [8 is likewise bifurcate (see Figure 3) and the lowerend of each leg thereof is pivotally carried on bearing 26. The upperend of link i 8 is pivotal- 1y mounted on a bearing 2? which extendsinto and is carried by the two legs i511 and Ifib of lever l6 which isalso bifurcate. A cam follower roller 28 is carried on bearing 26between the legs of link l8 so that it is in position to engage thebuilder cam 20 when such is in use.

The legs lta and iii?) are joined with a common bearing sleeve 16c(Figure 2) pivctally carried on a bearing 29 suitably mounted in thehousing 23. Each leg liia and 161) has laterally projecting portionsprovided with bearing sleeves i612 within which a shaft 38 is rotatablysupported. The cam 20 is keyed to the shaft 36 for rotation'therewith.

A cam follower roller 31 is carried rotatably on a shaft 32 secured inthe ends of the legs 16a and 46b of the lever It so that the roller isbetween the legs and engages cam [9.

Cam I9 is keyed to shaft 33 which is mounted rotatably in bearings onthe housing 23 and is driven by a sprocket 34 also keyed on the shaft. Aconstant speed motor 35 drives the cam l9 through shaft 36, sprocket 3?,and chain 38.

Assuming that the builder cam 20 is replaced by a-cylindrical member,such as a roll or disk, and that cam I9 is designed to provide constantrail speed with such cylindrical member 2a, the operation of themechanism so far described is as follows: Rotation of cam I9 alternatelylifts and lowers roll 31 thereby swinging lever I6 up and down on itspivotal bearing 28. This motion of lever I6 is transferred through linksl8 and I! to the bearing 25 on lever 15 which is thereby rocked aboutbearing 24. Since the cam 26 is replaced with a cylindrical member, androtation of such member has no efiect on the linkage so that the motionof the pivotal connection 54a is an oscillatory one between two definitelimits. This motion is transferred by link [4 to the rod l and therebyto all of the bell crank levers 3 by which 7 it is in turn transferredto the rail 2 through lever or levers 5 and the link or links 12. Levers5, as stated previously constrain the motion of rail 2 to astraight-line path which is vertical in the embodiment shown. The resultis the production of a winding of uniform depth across the full lengthor height of the bobbin.

A tapered package of any desired shape can be produced by changing cami9, or cam 20, or a combination of both.

When it is desired to produce a tapered top or bottle-shaped winding, abuilder cam 20 may be used and the mechanism for operating it is asfollows: As shown in Figures 2 and 3 and particularly in Figure 4, theshaft 35 has fixed to it for rotation therewith two ratchets 39 and ll]with teeth oppositely directed. A bifurcate lever M has its legs 41a andMb straddling the ratchets 39 and 40 and pivotally mounted on the shaft39. In the crotch of the lever 4| a driving pawl 12 is pivotally mountedon a shaft 43 carried by the legs of lever 4i. This pawl 42 drivesratchet 40. A spring 44 in a recess formed in the crotch of lever 41preferably is provided to bear against a lug 45 carried by the pawl 42and resiliently take up slack and shock in operation. A spring 45 isattached to the free end of lever BI and to the leg l'ob of lever 16 andnormally pulls the lever ll in a clockwise direction as viewed in Figure4.

Leg lfib of lever 16 carries a stub shaft '47 upon which there arerotatably mounted a return check pawl 48 and a forward check or lockingpawl 49 which co-operate with ratchetsss and :lil respectively. Thesepawls 4B and &9 are straddled by the legs of a bifurcate lever 59 alsorotatably mounted on shaft 41. A spring 51 disposed in a recess formedin the crotch of lever 58 bears against the locking pawl 49. Anotherspring 52 is secured to a pin 53 secured to a lug projecting back fromthe pawl 48. This spring passes through a bore 54 through the crotch oflever 50 to a point of securement on a pin 52a carried by leg [6b oflever I6 and normally biasses the pawl 48 in a clockwise direction aboutshaft fil to the limiting position shown (relative to lever 58) in whichthe lug thereon carrying pin 53 bears against the back wall of thecrotch of lever 56 (the upper inside wall indicated by the sloped dottedline w). Still another spring 55 is attached at 52a to leg lb of lever56 and a pin 55 secured to lever 50 and biasses the lever in a clockwisedirection about shaft 41. The lever fill has an end portion 57 whichengages the top of lever 5i and the lower surface of a detent 58 whichis adiustably secured to the inside wall of the housing 23 by cap screws59. Preferably, this end portion 5? is provided with rounded bearingsurfaces, as shown. A limiting detent or stop member (it is adjustablysecured to leg 16b of lever 58 and serves to limit the return stroke oflever 4| carrying pawl 42.

With the builder mechanism described, it is possible to obtain variouseffects by selection of differently shaped as well as different sizes ofmain cams I9 and builder cams 2:). To obtain a bottle-shaped windingsuch as is shown in Figure 5, links 1'! and I8 must have equal lengthand the size of the cam 99 is selected so that the axis of pivotalbearing 25 is coaxial with that of the at a fixed point.

connected to the rail 2, this fixed point corresponds to the lower endof the winding on the bobbin and all the changes of stroke take place atthe upper end of the stroke.

However, if links I! and iii are of unequal lengths, or if the rise ofcam I9 is insuflicient to cause pivots 25 and 21 to reach the coaxialrelationship, builder cam 20 will shift both ends of the stroke and awinding tapered at both ends is obtained. The character of the taper canbe varied by selection of the shape of the cam as well as by changingthe adjustment of stop 60, which latter changes the frequency ofrotation of the builder cam relative to the frequency of the cam l9.

To explain the operation of the'builder in more detail, assume themechanism is in the position shown in Figure 2 to start. Cam I9 islifting lever it about its pivot 29, and the upward swinging of shafts30 and 41 causes levers 50 and Si to swing clockwise about their shafts(as viewed in Figure 2) since they are in engagement with the stationarydetent 58. This swinging of lever 4| causes pawl 42 to rotate ratchet 4Band builder cam 20 in the direction of the arrow. After roller 3i passesbeyond the maximum point of rise of cam l9, lever l6 swings downwardlyon its pivot 29 and levers 50 and ii are swung back, the spring 46keeping them always in engagement and against detent 58 until lever 4|strikes stop 60. When lever 4i strikes stop 60 it no longer rotates onits pivot or shaft ea Thus the adjustment of stop 60 predetermines theextent of relative rotation of lever ll relative to shaft 30 during therising motion of the lever 16. This (together with the adjustment ofstop 58) predetermines the number of teeth of the ratchet which areracked forward by pawl 42 carried. on lever 4i during each swing oflever l6 and consequently the frequency of rotation of cam 20 relativetocam l9 can be predetermined in this way.

The rotation of cam 20 shifts link 11 and hence lever i relative to thepivotal connection of link I! to lever 16. This varies the extent ofswing of lever it on its pivot 24 relative to the swing of lever I6.When roller 28 is at the lowest point of cam 20, the greatest swing oflever i5 is obtained for a given swing of lever it; and similarly whenthe roller 28 is at the highest point of the builder cam 20, thesmallest swing of lever i5 is obtained.

The builder mechanism may be used with reciprocable rails supported inany suitable fashion other than that specifically disclosed herein.

It is to be understood that changes and variations may be made withoutdeparting from the spirit and scope of the invention as defined in theappended claims.

I claim:

1. A machine for winding a yarn or the like comprising a rail, aplurality of bell crank levers mounted in parallel relationship, meansfor swinging said levers in unison, supporting means for the railcarried by said levers, and means for constraining the motion of saidrail to a straight line, said last-named means consisting of linkspivotally interconnected for relative pivotal motion exclusively.

2. A machine for winding a yarn or the like comprising a rail, aplurality of bell crank levers mounted in parallel relationship, acommon rod connecting corresponding arms of the levers together, meansfor reciprocating the rod, parallel ek v ll contes in th e h me ihlevers to the rail, at least one of said links projecting beyond itspivotal connection with the rail, another link pivotally connected tothe projecting end of said projecting link and to a fixed bearing at aposition displaced away from the rail and the projecting link diagonallyopposite to the arm of the lever associated with said projecting link.

3. A machine for winding a yarn or the like comprising a reciprocablerail, supporting means for the rail comprising a lever, two linkspivotally secured to the lever, one adjacent each end thereof, saidlinks being secured pivotally to fixed members offset from the lever onopposite sides thereof, said rail being pivotally attached to the leverat such a position that when the pivotal connection coincides with thepoint of intersection of the lever with a line drawn between the pivotalconnections of the links to the fixed members, the rail is near themid-position of its stroke, and means connected to one of the links foroscillating said supporting means with the rail.

4. A machine for winding a yarn or the like comprising a rail, aplurality of bell crank levers mounted in parallel relationship, meansfor swinging said levers in unison, supporting means for the railcarried by said levers; said supporting means comprising a linkpivotally connected to a stationary bracket at a position offset fromthat side of the rail away from the fulcrums of the bell crank leversand also offset from the fulcrum of one of said levers in a directionparallel to the rail, a lever connecting said link to an arm of saidbell crank lever disposed entirely to one side of said rail, and apivotal connection between said connecting lever and said rail solocated that when said connection lies on a straight line extendingbetween said fulcrum and said ofiset position the rail is near themidposition of its stroke whereby the motion of said rail is constrainedto a straight line.

5. A machine for winding a yarn or the like comprising a rail, means forconstraining the motion of said rail to a straight-line, and buildermotion means for reciprocating the rail, said reciprocating meanscomprising a lever pivotally mounted on a fixed axis, a second leverpivotally mounted on a fixed axis offset from that of the first andoperatively connected to the rail to transmit reciprocating motionthereto, means for oscillating the first lever about its axis, a linkpivotally connected to the first lever, and a second link pivotallyconnected to the second lever and to the first link.

6. A machine for winding a yarn or the like comprising a rail, means forconstraining the motion of said rail to a straight-line, and buildermotion means for reciprocating the rail, said reciprocating meanscomprising a lever pivotally mounted on a fixed axis, a second leverpivotally mounted on a fixed axis offset from that of the first andoperatively connected to the rail to transmit reciprocating motionthereto, means for oscillating the first lever about its axis, a linkpivotally connected to the first lever, a second link pivotallyconnected to the second lever and to the first link, and means carriedby the first lever for'predeterminedly controlling the disposition ofthe pivotal connection between the links relative to the first lever.

'7. A machine for windinga yarn or the like comprising a rail, means forconstraining the motion of said rail to a straight-line, and buildermotion means for reciprocating therail, said re ciprocating means.comprising a lever pivotally mounted on a fixed axis, a second leverpivotally mounted on a fixed axis offset from that of the first andoperatively connected to the rail to transmit reciprocating motionthereto, means for oscillating the first lever about its axis, a linkpivotally connected to the first lever, a second link pivotallyconnected to the second lever and. to the first link, and a cam carriedby the first lever for predeterminedly controlling the disposition ofthe pivotal connection between the links relative to the first lever.

8. In a spinning or twisting machine, a rail, a builder mechanism forreciprocating the rail comprising a lever pivotally mounted on a fixedaxis, means for oscillating the lever about its axis, a link pivotallymounted on the lever at a position oifset from its axis and suspendedtherefrom, a second lever connected to the rail and pivotally mounted ona fixed axis offset from the first two axes, a link of the same lengthas the first link pivotally mounted on the second lever on an axisoffset from that of the second lever and pivotally connected to thefirst link on an axis offset from the pivotal connection of said firstlink with the first lever, the dispositions of said axes being sorelated that the projected path of the pivotal connection of the firstlink with the first lever about the axis of said lever as a centerintersects the projected path of the pivotal connection of the secondlink with the second lever about the axis of said lever, and meanscarried by the first lever for predeterminedly controlling thedisposition of the pivotal connection between the links relative to thefirst lever.

9. In a spinning or twisting machine, a rail, a builder mechanism forreciprocating the rail comprising a lever pivotally mounted on a fixedaxis, cam means for oscillating the lever about its a link pivotallymounted on the lever at a position ofiset from its axis and suspendedtherefrom, a second lever connected to the rail and pivotally mounted ona fixed axis offset from the first two axes, a link of the same lengthas the first link pivotally mounted on the second lever on an axisoffset from that of the second lever and pivotally connected to thefirst link on an axis offset from the pivotal connection of said firstlink with the first lever, the dispositions of said axes being sorelated that the projected path of the pivotal connection of the firstlink with the first lever about the axis of said lever as a centerintersects the projected path of. the pivotal connection of the secondlink with the second lever about the axis of said lever, a cam carriedrotatably by the first lever and having its periphery in engagement withthe pivotal connection between the two links, and means carried by thefirst lever for rotating the cam step by step in response to theswinging of the first lever.

10. In a spinning or twisting machine, a rail, a builder mechanism forreciprocating the rail comprising a lever pivotally mounted on a fixedaxis, cam means for oscillating the lever about its axis, a linkpivotally mounted on the lever at a position ofiset from its axis andsuspended therefrom, a second lever connected to the rail and pivotallymounted on a fixed axis offset from the first two axes, a link of thesame length as the first link pivotally mounted on the second lever onan axis ofiset from that of the second lever and pivotally connected tothe first link on an axis offset from the pivotal connection of saidfirst link with the first lever, the dispositions of said axes being sorelated that the projected path of the pivotal connection of the firstlink with the first lever about'the axis ofsaid lever as a centerintersects the projected path of the pivotal connection of the secondlink with the second lever about the axis of said lever, a cam carriedrotatably by the first lever and. having its periphery in engagementwith the pivotal connection between the two links, means carried by thefirst lever for rotating the cam step by step in response to theswinging of the first lever, and means for adjusting the length of thesecond lever.

11. In a spinning or twisting machine, a rail, a builder mechanism forreciprocating the rail comprising a lever pivotally mounted on a fixedaxis, cam means for oscillating the lever about its axis, a linkpivotally mounted on the lever at a position ofiset from its axis andsuspended therefrom, asecond lever connected to the rail and pivotallymounted on a fixed axis offset from the first two axes, a link of thesame length as the first link pivotally mounted on the second lever onan axis offset from that of the second lever. and pivotally connected tothe first link on an axis offset from the pivotal connection of saidfirst link with the first lever, the dispositions of said axes being sorelated that the projected path of the pivotal connection of the firstlink with the first lever about the axis of said lever as a centerintersects the projected path of the pivotal connection of the secondlink with the second lever about the axis of said lever, a cam carriedrotatably by the first lever and having its periphery in engagement withthe pivotal connection between the two links, means carried by the firstlever for rotating the cam step by step in response to the swinging ofthe first lever comprising a lever rotatably mounted coaxially withrespect to the cam, a ratchet mounted coaxially with respect to the camfor simultaneous rotation therewith, a pawl carried by said coaxiallymounted lever for driving the ratchet, a stationary detent for swingingsaid coaxially mounted lever to cause the pawl to drive the ratchet andthereby the cam during at least part of the stroke of the first lever.

'12. In a spinning or twisting machine, a rail, a builder mechanism forreciprocating the rail comprising a lever pivotally mounted on a fixedaxis, cam means for oscillating the lever about its axis, a linkpivotally mounted on the lever at a position offset from its axis andsuspended therefrom, a second lever connected to the rail and pivotallymounted on a fixed axis ofiset from the first two axes, a link of thesame length as the first link pivotally mounted on the second lever onan axis offset from that of the second lever and pivotally connected tothe first link on an axis offset from the pivotal connection of saidfirst link with the first lever, the dispositions of said axes being sorelated that the projected path of the pivotal connection of the firstlink with the first lever about the axis of said lever as a centerintersects the projected path of the pivotal connection of the secondlink with the second lever about the axis of said lever, a cam carriedrotatably by' the first lever and having its periphery in engagementwith the pivotal connection between the two links, means carried by thefirst lever for rotating the cam step by step in response to theswinging of the first leverv comprising a lever rotatably mountedcoaxially with V respect to the cam, a ratchet mountedcoaxially withrespect to the cam for simultaneous rotation therewith, a pawl carriedby said coaxially-"mounted lever for driving the ratchet, a stationarydetent for swinging said coaxially mounted lever to cause the pawl todrive the ratchet and thereby the cam during at least part of the strokeof the first lever, and a detent fixed on the first lever for limitingthe return swing of the coaxially mounted lever relative to the firstlever.

13. In a spinning or twisting machine, a rail, a builder mechanism forreciprocating the rail comprisin a lever pivotally mounted on a fixedaxis, cam means for oscillating the lever about its axis, a linkpivotally mounted on the lever at a position offset from its axis andsuspended therefrom, a second lever connected to the rail and pivotallymounted on a fixed axis ofiset from the first two axes, a link of thesame length as the first link pivotally mounted on the second lever onan axis ofiset from that of the second lever and pivotally connected tothe first, link on an axis offset from the pivotal connection of saidfirst link with the first lever, the dispositions of said axes being sorelated that the projected path of the pivotal connection of the firstlink with the first lever about the axis of said lever as a centerintersects the projected path of the pivotal connection of the secondlink with the second lever about the axis of said lever, a cam carriedrotatably by the first lever and having its periphery in engagement withthe pivotal connection between the two links, means carried by the firstlever for rotating the cam step by step in response to the swinging ofthe first lever comprising a lever rotatably mounted coaxially withrespect to the cam, a ratchet mounted coaxially with respect to the camfor simultaneous rotation therewith, a pawl carried by said coaxiallymounted lever for driving the ratchet, a stationary detent for swingingsaid coaxially mounted lever to cause the pawl to drive the ratchet andthereby the cam during at least part of the stroke of the first lever, adetent fixed on the first lever for limiting the return swing of thecoaxially mounted lever relative to the first lever, both of saiddetents being adjustable, and means for adjusting the length of thesecond lever.

14. A machine for winding a yarn or the like comprising a reciprocablerail and a builder mechanism for reciprocating the rail comprising alever pivotally mounted on a fixed axis, means for oscillating the leverabout its axis, a second lever pivotally mounted on a fixed axis offsetfrom that of the first and linkage means operatively connecting thesecond lever to the rail to transmit reciprocating motion thereto, alink pivotally connected to the first lever, a second link having alength equal to that of the first link and being pivotally connected tothe second lever and to the first link, and means for predeterminedlycontrolling the disposition of the pivotal connection between the linksrelative to the first lever.

15. A machine for winding a yarn or the like comprising a reciprocablerail and a builder mechanism for reciprocating the rail comprising alever pivotally mounted on a fixed axis, means for oscillating the leverabout its axis, a second lever pivotally mounted on a fixed axis offsetfrom that of the first and linkage means operatively connecting thesecond lever to the rail to transmit reciprocating motion thereto, alink pivotally connected to the first lever, a second link having alength equal to that of the first link and being pivotally connected tothe second lever and to the first link, and means carried by the firstlever for predeterminedly controlling 10 the disposition of the pivotalconnection between the links relative to the first lever.

16. A machine for winding a yarn or the like comprising a reciprocablerail and a builder mechanism for reciprocating the rail comprising alever pivotally mounted on a fixed axis, means for oscillating the leverabout its axis, a second lever pivotally mounted on a fixed axis offsetfrom that of the first and linkage means operatively connecting thesecond lever to the rail to transmit reciprocatory motion thereto, alink pivotally connected to the first lever, a second link having alength equal to that of the first link and being pivotally connected tothe second lever and to the first link, a cam rotatably carried on thefirst lever and having its periphery in engagement with the pivotalconnection between the two links, and means for rotating the cam.

17. A machine for winding a yarn or the like comprising a reciprocablerail and a builder mechanism for reciprocating the rail comprising alever pivotally mounted on a fixed axis, means for oscillating the leverabout its axis, a second lever pivotally mounted on a fixed axis ofisetfrom that of the first and linkage means operatively connecting thesecond lever to the rail to transmit reciprocatory motion thereto, alink pivotally connected to the first lever, a second link having alength equal to that of the first link and being pivotally connected tothe second lever and to the first link, a cam rotatably carried on thefirst lever and having its periphery in engagement with the pivotalconnection between the two links, and means carried by the first leverfor rotating the cam at a predetermined frequency relative to thefrequency of oscillation of the first lever.

18. A machine for winding a yarn or the like comprising a reciprocablerail and a builder mechanism for reciprocating the rail comprising alever pivotally mounted on a fixed axis, rotating cam means foroscillating the lever about its axis, a second lever pivotally mountedon a fixed axis offset from that of the first and linkage meansoperatively connecting the second lever to the rail to transmitreciprocatory motion thereto, a link pivotally connected to the firstlever, a second link having a length equal to that of the first link andbeing pivotally connected to the second lever and to the first link, a.cam rotatably carried on the first lever and having its periphery inengagement with the pivotal connection between the two links, and meanscarried by the first lever for rotating the cam at a predeterminedfrequency relative to the frequency of oscillation of the first lever.

ERNEST K. BAUER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 953,813 Bergmann et a1 Apr. 5,1910 2,152,982 Watson et al. Apr. 4, 1939 2,368,830 Harrison Feb. 6,1945 2,427,394 Eshleman Sept. 16, 1947 FOREIGN PATENTS Number CountryDate 245,248 Great Britain July 8, 1925

